High resolution low power consumption OLED display with extended lifetime
Full-color pixel arrangements for use in devices such as OLED displays are provided, in which multiple sub-pixels are configured to emit different colors of light, with each sub-pixel having a different optical path length than some or all of the other sub-pixels within the pixel.
1. A full-color pixel arrangement for an OLED device, the full-color pixel arrangement comprising:
a first sub-pixel comprising an emissive region of a first color and having a first optical path length;
a second sub-pixel comprising an emissive region of the first color, the second sub-pixel having a second optical path length different than the first optical path length;
a third sub-pixel comprising an emissive region of a second color;
wherein the full-color pixel arrangement comprises emissive regions of exactly two different colors.
2. The full-color pixel arrangement of claim 1 , further comprising:
a fourth sub-pixel comprising an emissive region of the first color, the fourth sub-pixel having a third optical path length different than the first optical path length.
3. The full-color pixel arrangement of claim 2 , wherein the third optical path length is different than the second optical path length.
4. The full-color pixel arrangement of claim 1 , wherein the full-color pixel arrangement comprises N total sub-pixels comprising an emissive region of the first color, and at least one pixel further comprises 0 to N−1 color altering layers.
5. The full-color pixel arrangement of claim 4 , wherein the full-color pixel arrangement comprises N+1 total sub-pixels.
6. The full-color pixel arrangement of claim 5 , wherein the at full-color pixel arrangement comprises N+2 total sub-pixels.
7. The full-color pixel arrangement of claim 1 , wherein the full-color pixel arrangement comprises zero color altering layers.
8. The full-color pixel arrangement of claim 1 , wherein each emissive region of the first color comprises a plurality of emissive materials disposed within a single emissive layer.
9. The full-color pixel arrangement of claim 8 , wherein the single emissive layer comprises
a first emissive material of a third color; and
a second emissive material of a fourth color;
wherein each of the third and fourth colors are different from each of the first and second colors.
10. The full-color pixel arrangement of claim 1 , wherein the first sub-pixel comprises a first bottom electrode having a first thickness, and the second sub-pixel comprises a second bottom electrode having a second thickness different than the first thickness.
11. The full-color pixel arrangement of claim 1 , wherein the first emissive region has a first thickness, and the second emissive region has a second thickness different than the first thickness.
12. The full-color pixel arrangement of claim 1 , further comprising a color altering layer disposed in a stack with the first sub-pixel.
13. An OLED device comprising the full-color pixel arrangement of claim 1 .
14. The OLED device of claim 13 , wherein the OLED device is a display having a resolution of at least 250 dpi.
15. The OLED device of claim 13 , wherein the device is a type selected from the group consisting of: a wearable device, a flat panel display, a computer monitor, a medical monitor, a television, a billboard, a light for interior or exterior illumination, a signal, a color tunable or color temperature tunable lighting source, a heads-up display, a fully transparent display, a flexible display, a 3D display, a laser printer, a telephone, a cell phone, a personal digital assistant (PDA), a laptop computer, a digital camera, a camcorder, a viewfinder, a micro-display, a vehicle, a large area wall, a theater or stadium screen, and a sign.
16. A method of fabricating a full-color pixel arrangement for an OLED device, the method comprising:
fabricating a patterned layer having a pattern over a first area of a substrate, the pattern defining at least two sub-pixel regions over the substrate;
depositing a first emissive material over the at least two sub-pixel regions;
depositing a second emissive material over a second area of the substrate, wherein the second area does not overlap the first area;
fabricating an electrode layer over the first emissive material and the second emissive material;
wherein the at least two sub-pixel regions have different optical path lengths between the substrate and the electrode layer.
17. The method of claim 16 , wherein the patterned layer is a layer deposited over an electrode layer disposed over the substrate and below the patterned layer.
18. The method of claim 16 , wherein the patterned layer is an electrode layer.
19. The method of claim 16 , wherein the step of fabricating the patterned layer comprises patterning an electrode layer disposed over the substrate.
20. The method of claim 19 , wherein the step of patterning the electrode layer comprises a photolithographic technique.